Rebuilding the carburettor may be required if basic adjustments don’t fix your engine problems or improve performance on your lawn mower or outdoor power equipment.
Most carburettor problems are caused by dirt particles, varnish and other deposits that block the narrow fuel and air passages inside. Gaskets and O-rings are also common sources of problems. They eventually shrink, causing fuel and air leaks that lead to poor engine performance.
Follow the steps below for overhauling engine carburettors.